Method test_trackfd_parameter

Lib/test/test_mmap.py:269–305

(self, close_original_fd)

    @support.subTests('close_original_fd', (True, False))
    def test_trackfd_parameter(self, close_original_fd):
        size = 64
        with open(TESTFN, "wb") as f:
            f.write(b"a"*size)
        with open(TESTFN, "r+b") as f:
            with mmap.mmap(f.fileno(), size, trackfd=False) as m:
                if close_original_fd:
                    f.close()
                self.assertEqual(len(m), size)
                with self.assertRaises(ValueError):
                    m.size()
                if hasattr(m, 'resize'):
                    with self.assertRaises(ValueError):
                        m.resize(size * 2)
                    with self.assertRaises(ValueError):
                        m.resize(size // 2)
                self.assertIs(m.closed, False)

                # Smoke-test other API
                m.write_byte(ord('X'))
                m[2] = ord('Y')
                m.flush()
                with open(TESTFN, "rb") as f:
                    self.assertEqual(f.read(4), b'XaYa')
                self.assertEqual(m.tell(), 1)
                m.seek(0)
                self.assertEqual(m.tell(), 0)
                self.assertEqual(m.read_byte(), ord('X'))

                if os.name == 'nt' and not close_original_fd:
                    self.assertRaises(PermissionError, os.rename, TESTFN, TESTFN+'1')
                else:
                    os.rename(TESTFN, TESTFN+'1')
                    os.rename(TESTFN+'1', TESTFN)

        self.assertIs(m.closed, True)
        self.assertEqual(os.stat(TESTFN).st_size, size)

    def test_trackfd_neg1(self):
        size = 64